Create VSTO 3.0 Outlook Add In to run on office 2003/2007/2010(x32 and x64)

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Is it possible to create an add in that works on all office versions?

I searched the msdn and different forums but there is nothing specific about this issue.

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domke consulting On BEST ANSWER

Difficult if you use VSTO, because you'll need to deploy/assure different runtime libraries. See the VSTO entry in Wikipedia, not to speak of different development and test platforms (which you may already have, if you aim for it).

There's a MSDN Blog from Mary Lee the migration of 2007 to 2010 projects.

Please see also this blog from Andrew Whitechapel: Can you build one add-in for multiple versions of Office?

From a pragmatical point of view ("time-to-market"), you may consider the use of a third-party-tool (www.add-in-express.com), which allows the creation of version-independent add-ins.